Effect of Yb3+ codopant on the upconversion and thermoluminescent emission of Sr2CeO4:Er3+, Yb3+ phosphors. (October 2020)

• Record Type: Journal Article
• Authors: Viesca-Villanueva, E.; Oliva, J.; Chavez, D.; Lopez-Badillo, C.M.; Gomez-Solis, C.; Mtz-Enriquez, A.I.; Garcia, C.R.
• Is Part Of: Journal of physics and chemistry of solids. Volume 145(2020)
• Publication Date: 2020-10
• Subjects: Upconversion emission -- Erbium -- Ytterbium -- Thermoluminescence -- Sr2CeO4; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2020.109547
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: This work presents the structural, morphological, upconversion luminescence and Thermoluminescence properties of Sr2 CeO4 :Er 3+, Yb 3+ (SCO:Er, Yb) phosphors synthesized by a simple combustion method. The X-ray diffraction technique revealed that all the samples maintained their orthorhombic phase even for Yb concentrations as high as 12 mol%. Moreover, the morphological analysis by scanning electron microscopy (SEM) pointed out that SCO microparticles with sizes in the range of 0.2 μm–7.2 μm were obtained in samples doped with 0–3 mol% of Yb, but coalesced microparticles were observed for Yb concentrations from 7 to 12 mol%. The luminescence measurements demonstrated that the SCO: Er, Yb microparticles produced red and green upconversion emission bands and the red component increases with the Yb concentration. Also, the TL signals were recorded after solar/UV irradiation and found TL emission bands in the range of 60–150 °C and 150–350 °C. The traps responsible of the TL emissions were the oxygen vacancies. Highlights: The Upconversion emission of SCO:Er, Yb phosphors were tuned from green to red with the Yb concentration. The thermoluminescent properties of SCO:Er, Yb phosphors were studied under solar/UV excitation. Strong thermoluminescent emission was produced by SCO:Er, Yb phosphors in the range of 60–150 °C. The optimum Yb concentration for the highest upconversion and thermoluminescent emission was 7 mol%.